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  <head>
    <title>CSS Writing Modes Test: vertical align - 'zero length (0em)' (central baseline with vertical layout)</title>
    <link rel="author" title="Hajime Shiozawa" href="mailto:hajime.shiozawa@gmail.com" />
    <link rel="help" title="4.4. Baseline Alignment" href="http://www.w3.org/TR/css3-writing-modes/#baseline-alignment" />
    <link rel="help" title="10.8 Line height calculations: the 'line-height' and 'vertical-align' properties" href="http://www.w3.org/TR/CSS2/visudet.html#line-height" />
    <meta name="assert" content="This test checks the generation of text baseline with vertical align property. When 'writing-mode' is vertical and when 'text-orientation' is 'mixed', 'upright' or 'use-glyph-orientation', then the central baseline is used as the dominant baseline." />
    <meta name="flags" content="ahem image" />
    <style type="text/css"><![CDATA[
      div > p {
        font: 40px/1 "Ahem";
        background-color: orange;
      }
      p > span {
        line-height: 1em;
      }

      /* vertical-align */
      img {
        vertical-align: +50%;
      }
      img.box {
        margin-top: -50px;
      }
      img.line {
        margin-top: -210px;
      }

      /* writing-mode property */
      .vertical-lr {
        writing-mode: vertical-lr;
      }

      /* text-orientation property */
      .mixed {
        text-orientation: mixed;
      }
      .upright {
        text-orientation: upright;
      }
      .use-glyph-orientation {
        text-orientation: use-glyph-orientation;
      }

      /* font-size */
      .half {
        vertical-align: text-top;
        font-size: 1em;
      }
  ]]></style>
  </head>
  <body>
    <p>Test passes if ...</p>
    <ol>
      <li>the <strong>left</strong> edge of black stripe is touching a thin blue line in each 3 orange rectangles.</li>
      <li>the <strong>center</strong> of yellow box (showed as a blue line) is aligned to a thin blue line in each 3 orange rectangles.</li>
      <li>all 3 orange rectangles are <strong>identical</strong>.</li>
    </ol>
    <div class="vertical-lr">
      <p class="mixed"><span class="outer"><span class="half">LLLLLLLLLp</span>
          <img class="line" src="./support/blue-vert-line_1x220.png" alt="Image download support must be enabled" />
          <img class="box" src="./support/vert-box_29x29.png" alt="Image download support must be enabled" /></span>
      </p>
      <p class="upright"><span class="outer"><span class="half">LLLLLLLLL</span>
          <img class="line" src="./support/blue-vert-line_1x220.png" alt="Image download support must be enabled" />
          <img class="box" src="./support/vert-box_29x29.png" alt="Image download support must be enabled" /></span>
      </p>
      <p class="use-glyph-orientation"><span class="outer"><span class="half">LLLLLLLLL</span>
          <img class="line" src="./support/blue-vert-line_1x220.png" alt="Image download support must be enabled" />
          <img class="box" src="./support/vert-box_29x29.png" alt="Image download support must be enabled" /></span>
      </p>
    </div>
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